TY  - JOUR
AU  - Jose, Ajay
AU  - Bansal, Mahima
AU  - Svirskis, Darren
AU  - Swift, Simon
AU  - Gizdavić-Nikolaidis, Marija
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13186
AB  - The potential application of colloidal polyaniline (PANI) as an antimicrobial is limited by challenges related to solubility in common organic solvents, scalability, and antimicrobial potency. To address these limitations, we introduced a functionalized PANI (fPANI) with carboxyl groups through the polymerisation of aniline and 3-aminobenzoic acid in a 1:1 molar ratio. fPANI is more soluble than PANI which was determined using a qualitative study. We further enhanced the solubility and antimicrobial activity of fPANI by incorporating Ag nanoparticles onto the synthesized fPANI colloid via direct addition of 10 mM AgNO3. The improved solubility can be attributed to an approximately 3-fold reduction in size of particles. Mean particle sizes are measured at 1322 nm for fPANI colloid and 473 nm for fPANI-Ag colloid, showing a high dispersion and deagglomeration effect from Ag nanoparticles. Antimicrobial tests demonstrated that fPANI-Ag colloids exhibited superior potency against Gram-positive Staphylococcus aureus, Gram-negative Escherichia coli, and Bacteriophage PhiX 174 when compared to fPANI alone. The minimum bactericidal concentration (MBC) and minimum virucidal concentration (MVC) values were halved for fPANI-Ag compared to fPANI colloid and attributed to the combination of Ag nanoparticles with the fPANI polymer. The antimicrobial fPANI-Ag colloid presented in this study shows promising results, and further exploration into scale-up can be pursued for potential biomedical applications.
T2  - Colloids and Surfaces B: Biointerfaces
T1  - Synthesis and characterization of antimicrobial colloidal polyanilines
VL  - 238
SP  - 113912
DO  - 10.1016/j.colsurfb.2024.113912
ER  - 

@article{
author = "Jose, Ajay and Bansal, Mahima and Svirskis, Darren and Swift, Simon and Gizdavić-Nikolaidis, Marija",
year = "2024",
abstract = "The potential application of colloidal polyaniline (PANI) as an antimicrobial is limited by challenges related to solubility in common organic solvents, scalability, and antimicrobial potency. To address these limitations, we introduced a functionalized PANI (fPANI) with carboxyl groups through the polymerisation of aniline and 3-aminobenzoic acid in a 1:1 molar ratio. fPANI is more soluble than PANI which was determined using a qualitative study. We further enhanced the solubility and antimicrobial activity of fPANI by incorporating Ag nanoparticles onto the synthesized fPANI colloid via direct addition of 10 mM AgNO3. The improved solubility can be attributed to an approximately 3-fold reduction in size of particles. Mean particle sizes are measured at 1322 nm for fPANI colloid and 473 nm for fPANI-Ag colloid, showing a high dispersion and deagglomeration effect from Ag nanoparticles. Antimicrobial tests demonstrated that fPANI-Ag colloids exhibited superior potency against Gram-positive Staphylococcus aureus, Gram-negative Escherichia coli, and Bacteriophage PhiX 174 when compared to fPANI alone. The minimum bactericidal concentration (MBC) and minimum virucidal concentration (MVC) values were halved for fPANI-Ag compared to fPANI colloid and attributed to the combination of Ag nanoparticles with the fPANI polymer. The antimicrobial fPANI-Ag colloid presented in this study shows promising results, and further exploration into scale-up can be pursued for potential biomedical applications.",
journal = "Colloids and Surfaces B: Biointerfaces",
title = "Synthesis and characterization of antimicrobial colloidal polyanilines",
volume = "238",
pages = "113912",
doi = "10.1016/j.colsurfb.2024.113912"
}

Jose, A., Bansal, M., Svirskis, D., Swift, S.,& Gizdavić-Nikolaidis, M.. (2024). Synthesis and characterization of antimicrobial colloidal polyanilines. in Colloids and Surfaces B: Biointerfaces, 238, 113912.
https://doi.org/10.1016/j.colsurfb.2024.113912

Jose A, Bansal M, Svirskis D, Swift S, Gizdavić-Nikolaidis M. Synthesis and characterization of antimicrobial colloidal polyanilines. in Colloids and Surfaces B: Biointerfaces. 2024;238:113912.
doi:10.1016/j.colsurfb.2024.113912 .

Jose, Ajay, Bansal, Mahima, Svirskis, Darren, Swift, Simon, Gizdavić-Nikolaidis, Marija, "Synthesis and characterization of antimicrobial colloidal polyanilines" in Colloids and Surfaces B: Biointerfaces, 238 (2024):113912,
https://doi.org/10.1016/j.colsurfb.2024.113912 . .

TY  - JOUR
AU  - Jose, Ajay
AU  - Yadav, Pooja
AU  - Svirskis, Darren
AU  - Swift, Simon
AU  - Gizdavić-Nikolaidis, Marija
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12827
AB  - Surface contamination and transmission can lead to Hospital Acquired Infections (HAI) in a healthcare environment. To tackle this problem, a sustainable antimicrobial coating is desirable. Photocatalytic coatings with titanium dioxide (TiO2) as the main component activated by UV light are one option. In order to implement the coating in a real-world hospital setting the photocatalytic component must show activity under visible light. In this article the TiO2 photocatalyst was synthesised as both 2- and 3- component composites with polyaniline (PANI) or poly(aniline-co-3-aminobenzoic acid) (fPANI) and Ag nanoparticles to achieve photocatalytic performance activated by visible light. The UV-DRS results supported the visible light photocatalytic capability of both 2- and 3-component composite systems, and the ESR spectra exhibited the presence of charge carriers (unpaired electrons), which was confirmed by conductivity studies. The intensity of the ESR peak increases around 3-fold for PANI/fPANI-TiO2-Ag composites compared to pure PANI/fPANI. The conductivity of pure PANI and fPANI was only mildly enhanced in 3-component systems, which could be due to presence of TiO2, whereas the value increased by around three times for PANI/fPANI-Ag 2-component system due to conductive Ag nanoparticles. The composites with fPANI showed improved antimicrobial activity than PANI composites against three representative microorganisms Escherichia coli, Staphylococcus aureus and a model viral strain bacteriophage Phi X 174. Finally, we proposed a mechanism for photocatalytic activity for both 2- and 3- component systems.
T2  - Synthetic Metals
T1  - Antimicrobial photocatalytic PANI based-composites for biomedical applications
VL  - 303
SP  - 117562
DO  - 10.1016/j.synthmet.2024.117562
ER  - 

@article{
author = "Jose, Ajay and Yadav, Pooja and Svirskis, Darren and Swift, Simon and Gizdavić-Nikolaidis, Marija",
year = "2024",
abstract = "Surface contamination and transmission can lead to Hospital Acquired Infections (HAI) in a healthcare environment. To tackle this problem, a sustainable antimicrobial coating is desirable. Photocatalytic coatings with titanium dioxide (TiO2) as the main component activated by UV light are one option. In order to implement the coating in a real-world hospital setting the photocatalytic component must show activity under visible light. In this article the TiO2 photocatalyst was synthesised as both 2- and 3- component composites with polyaniline (PANI) or poly(aniline-co-3-aminobenzoic acid) (fPANI) and Ag nanoparticles to achieve photocatalytic performance activated by visible light. The UV-DRS results supported the visible light photocatalytic capability of both 2- and 3-component composite systems, and the ESR spectra exhibited the presence of charge carriers (unpaired electrons), which was confirmed by conductivity studies. The intensity of the ESR peak increases around 3-fold for PANI/fPANI-TiO2-Ag composites compared to pure PANI/fPANI. The conductivity of pure PANI and fPANI was only mildly enhanced in 3-component systems, which could be due to presence of TiO2, whereas the value increased by around three times for PANI/fPANI-Ag 2-component system due to conductive Ag nanoparticles. The composites with fPANI showed improved antimicrobial activity than PANI composites against three representative microorganisms Escherichia coli, Staphylococcus aureus and a model viral strain bacteriophage Phi X 174. Finally, we proposed a mechanism for photocatalytic activity for both 2- and 3- component systems.",
journal = "Synthetic Metals",
title = "Antimicrobial photocatalytic PANI based-composites for biomedical applications",
volume = "303",
pages = "117562",
doi = "10.1016/j.synthmet.2024.117562"
}

Jose, A., Yadav, P., Svirskis, D., Swift, S.,& Gizdavić-Nikolaidis, M.. (2024). Antimicrobial photocatalytic PANI based-composites for biomedical applications. in Synthetic Metals, 303, 117562.
https://doi.org/10.1016/j.synthmet.2024.117562

Jose A, Yadav P, Svirskis D, Swift S, Gizdavić-Nikolaidis M. Antimicrobial photocatalytic PANI based-composites for biomedical applications. in Synthetic Metals. 2024;303:117562.
doi:10.1016/j.synthmet.2024.117562 .

Jose, Ajay, Yadav, Pooja, Svirskis, Darren, Swift, Simon, Gizdavić-Nikolaidis, Marija, "Antimicrobial photocatalytic PANI based-composites for biomedical applications" in Synthetic Metals, 303 (2024):117562,
https://doi.org/10.1016/j.synthmet.2024.117562 . .